Using a gpx that someone has been created for the exclusive use of paying participants wouldn't be illegal. There are no laws against it. But it would be considered immoral.
Sorry. I don't think following a route described by a gpx file is immoral, whoever has created the file. It's a route description; no more, no less; and as has been said, the roads are free to ride, without the handicap of moral conflict.
I'm pleased to see all and every cyclist out on the roads. Confess I was not so pleased to see some LEL riders joined by a strong rider from St Ives who shamelessly (well the blokes showed no shame) offered her wheel to all and sundry (so I rode away from them
![Angel O:-)](/forum/Smileys/classic/angel.gif)
and got lost in Cambridge). On the plus side it would have been nice for the well built dad to have support and the riding companionship of his daughter (assumed
![Smiley :)](/forum/Smileys/classic/smiley.gif)
) on that last day after the 'winds'.
"9.9.3 Participants may ride singly or in groups and may pace each other but may not be paced by
any other cyclist [ie non-participant] or motor vehicle."
If I wish to use a loo in a pub or even a McDonalds (without being a customer), I will always ask permission. To use it without permission is impolite (but not immoral imo).